Abstract
Industrial hemp, Cannabis sativa L., production has been negatively impacted by larvae of corn earworm, Helicoverpa zea (Boddie), which feed on developing inflorescences. Adult H. zea oviposit on hemp once flowers develop, and late-instar larvae can cause serious loss to both quality and yield. A 2-year study to assess the influence of hemp variety and fertilization practices on damage caused by H. zea was conducted. Differences in damage ratings among varieties were observed in both years; however, the rate of nitrogen applied did not influence biomass yield or damage rating. These results indicate that increasing nitrogen fertility may not be an effective means of cultural control for mitigating damage from H. zea. Floral maturity was very influential on damage caused by H. zea as late-maturing varieties had much less floral injury than those which matured early in outdoor field trials. Some cannabinoids were also correlated to damage rating, but this relationship was due to late-maturing plants with immature flowers low in cannabinoid concentrations receiving less floral injury. Based on these results, the selection of high-yielding varieties that flower when ovipositional activity of H. zea is expected to decline should be the first step in an integrated pest management program for hemp production. This research expanded our knowledge of the role of fertility rate, varietal characteristics, cannabinoid profile, and floral maturity on damage caused by H. zea to hemp. Findings from this research will allow growers to make more informed agronomic decisions before planting to improve hemp production.
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Claims 6
Claim · model-written summary
Damage ratings by Helicoverpa zea differ among hemp varieties in both years.
- Taxon
- Cannabis sativa
Cannabis sativat0 - Material
- varietiese1
- Interactor
- Helicoverpa zea
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Helicoverpa zeat1pest - Outcome
- damage ratingse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Influence of varieties of hemp, Cannabis sativa”
t1“corn earworm, Helicoverpa zea”
e1“Differences in damage ratings among varieties were observed in both years”
Claim · model-written summary
The rate of nitrogen applied does not influence hemp biomass yield or damage rating.
- Taxon
- Cannabis sativaCannabis sativat0
- Treatment
- rate of nitrogen appliede2
- Outcome
- biomass yield or damage ratinge2
- Direction
- no_changeinferrede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of varieties of hemp, Cannabis sativa”
e2“the rate of nitrogen applied did not influence biomass yield or damage rating”
Claim · model-written summary
Floral maturity is very influential on damage caused by Helicoverpa zea to hemp.
- Taxon
- Cannabis sativaCannabis sativat0
- Treatment
- Floral maturitye3
- Interactor
- H. zeaHelicoverpa zeae3pest
- Outcome
- damage caused by H. zeae3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of varieties of hemp, Cannabis sativa”
t1“corn earworm, Helicoverpa zea”
e3“Floral maturity was very influential on damage caused by H. zea”
Claim · model-written summary
Late-maturing hemp varieties have much less floral injury than early-maturing varieties in outdoor field trials.
- Taxon
- Cannabis sativaCannabis sativat0
- Material
- late-maturing varietiese4
- Outcome
- floral injurye4
- Direction
- lesse4
- Comparator
- those which matured earlye4
- Setting
- outdoor field trialse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of varieties of hemp, Cannabis sativa”
e4“late-maturing varieties had much less floral injury than those which matured early in outdoor field trials”
Claim · model-written summary
Some cannabinoids are correlated with damage rating, but this is due to late-maturing plants with immature flowers.
- Taxon
- Cannabis sativaCannabis sativat0
- Compound
- cannabinoidse5
- Outcome
- damage ratinge5
- Qualifier
- late-maturing plants with immature flowerse5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of varieties of hemp, Cannabis sativa”
e5“Some cannabinoids were also correlated to damage rating, but this relationship was due to late-maturing plants with immature flowers low in cannabinoid concentrations receiving less floral injury”
Claim · model-written summary
Selecting high-yielding hemp varieties that flower when H. zea oviposition declines should be the first step in an integrated pest management program.
- Taxon
- hemp
Cannabis sativa subsp. sativae6 - Outcome
- selection of high-yielding varietiese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“the selection of high-yielding varieties that flower when ovipositional activity of H. zea is expected to decline should be the first step in an integrated pest management program for hemp production”
The same questions in other papers
nitrogen · pest · Cannabis sativaResults agree
1 paper in the same direction as this paper
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.